344.反转字符串.py

#
# @lc app=leetcode.cn id=344 lang=python3
#
# [344] 反转字符串
#

# @lc code=start
class Solution:
    # def reverseString(self, s: List[str]) -> None:
    #     """
    #     Do not return anything, modify s in-place instead.
    #     """

    #     return s.reverse()


    # 双指针
    def reverseString(self, s: List[str]) -> None:
        """
        Do not return anything, modify s in-place instead.
        """

        l = 0
        r = len(s)-1

        while l < r :
            s[l] , s[r] = s[r] , s[l]
            l += 1
            r -= 1

    


    
# @lc code=end